Determine the mass number of an element that contains 26 protons, 22 electrons, and 30 neurons

Answer:

Electrons are always marked negative Hence electronic energy is also always taken as negative. It is because when an electron is at infinite distance from nucleus , there the kinetic energy of that electron can not be calculated. So, it is taken to be zero . ... And thus the energy of electron becomes less negative

Answer:

we required 15 ounce tomato sauce for 3 pizza

Explanation:

Given data:

Crust = 4

Cheese = 10 cups

number of ounces of tomato sauce for 3 pizza = ?

Solution:

Recipe and ingredients for one pizza:

1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza

Ingredients required for 3 pizza;

1 × 3 crust + 5 ×3 ounce tomato sauce + 2×3  cups cheese  → 3 pizaa

3 crust + 15 ounce tomato sauce + 6 cups cheese  → 3 pizaa

So we required 15 ounce tomato sauce for 3 pizza.

15 ounce tomato sauce for 3 pizzas.

Given:-

Crust = 4

Cheese = 10 cups

number of ounces of tomato sauce for 3 pizza = ?

1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza

[tex]1 \times 3 crust + 5 \times3 ounce tomato sauce + 2\times3 cups cheese\rightarrow 3 pizaa[/tex]

[tex]3 crust + 15 ounce tomato sauce + 6 cups cheese\rightarrow3 pizaa[/tex]

So we required 15 ounce tomato sauce for 3 pizza.

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Answer:

The law of definite proportions

Explanation:

The law of definite proportions states that atoms combine in a molecule in a specific molar ratio or specific stoichiometry. For example, it's proved that regardless of the quantity we take, two hydrogen atoms always combine with one oxygen atom to form a water molecule.

Similarly, ionic substances follow the same pattern. Since the net charge of ionic salts should be equal to 0 and each element has a definite number of valence electrons in its shell all the time, the ions combine in a way, so that cations balance the charge of anions.

Essentially, the law of definite proportions is applicable and will be applicable in the future, since we know that each element has a fixed number of valence electrons in its ground state.

Answer:

Now "q" is  the heat and energy is the capacity of any object or body ton perform any work. So we can relate them if we take the term specific heat in consideration.

As specific heat is the the amount of heat required to raise the temperature of an object in specific from one degree Celsius, for ice it is 2.108 kJ/kgK.

Explanation:

So, we have:

Answer:

Going up the group

Explanation:

In any main group, the first ionization energy increases going up the group, while going down, it decreases.

The reason for that lies in understanding the fundamentals of the Coulombic attraction force. Going down the group, atomic radius increases. When atomic radius increases, the distance between a nucleus and valence electrons increases. According to the Coulomb's equation, force is inversely proportional to the square of the distance. This implies that the greater the radius, the lower the attraction between a nucleus and valence electrons.

Now, the lower the attraction, the lower the energy required to remove the electron.

That said, the first ionization energy increases up the group, as atomic radius decreases.

Answer:

From left to right across a period

Explanation:

It would be nice if you could state the questions so it was easier to tell what your options were,  but the answer to this is: “from left to right across a period” something close to that

Answer: a. 0.05mol/dm3

bi. 0.045mol/dm3

bii. 4.41g/dm3

c. 84.8%

Explanation:Please see attachment for explanation

Answer:

Explanation:

The net charge is the difference between the number of protons, which have positive charges, and electrons, which have negative charges. All atoms and ions of iron have 26 protons. Iron's atomic number is 26. Atoms don't gain or lose protons.

The nuclear charge is the total charge of all the protons in the nucleus. It has the same value as the atomic number. The nuclear charge increases you go across the periodic table.

The net charge is the difference between the number of protons, which have positive charges, and electrons, which have negative charges. All atoms and ions of iron have 26 protons. Iron's atomic number is 26. Atoms don't gain or lose protons.

The nuclear charge is the total charge of all the protons in the nucleus. It has the same value as the atomic number. The nuclear charge increases you go across the periodic table.

The effective nuclear charge can be calculated by subtracting the number of inner shell electrons from the number of protons. Sodium, for example, has 10 inner electrons and 11 protons, giving it an effective nuclear charge of +1.

+26 Iron has 26 protons in the nucleus each with a charge of +1.

Thus,  All atoms and ions of iron have 26 protons. Iron's atomic number is 26.

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Answer:

The first question is 4

The second one is 1

Explanation:

Please mark brainliest! Hope it helped!

Answer:

The correct option is C) Very low

Explanation:

In physics, resistance can be described as the opposition to the flow of current or the flow of electrons. Conductors are known to be materials which can conduct electricity. Hence, conductivity and resistance are opposite to each other. Good conductors will have very little or no resistance and will have enhanced conductivity. On the contrary, insulators are materials which will have more resistance and they cannot conduct electricity as efficiently.

Answer:

low

Explanation:

Answer: The three main factors of weather are light (solar radiation), water (moisture) and temperature.

The three major factors of weather are light (solar radiation), water (moisture) and temperature.

Weather is the day-to-day state of the atmosphere, and its short-term variation in minutes to weeks.

We generally think of weather as the combination of temperature, humidity, precipitation, cloudiness, visibility, and wind

Total Factors that affect the weather condition: temperature, pressure, moisture content, speed and direction in which its moves.

One factor is that the sun does not heat all parts of the earth equally; the resulting difference in density and pressure causes the air to move from different places.

Hence, The three major factors of weather are light (solar radiation), water (moisture) and temperature.

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Answer:

The answer is (C) the kinetic energy of particles in a system.

Final answer:

Thermal energy is the kinetic energy of the particles in a system, associated with their random motion. It increases with temperature, highlighting the link between kinetic energy and temperature as a measure of this energy's concentration.

Explanation:

Thermal energy is essentially the kinetic energy associated with the random motion of atoms and molecules in a system. It represents a form of internal energy that is dependent on temperature, increasing as the temperature of the system rises. This form of energy is related to the movement—whether through vibration, rotation, or translational motion—of the particles within a system. It's important to differentiate between thermal energy and temperature; while thermal energy refers to the kinetic energy of the particles, temperature is a measure that represents the average kinetic energy of those particles.

Considering the options provided in the question, thermal energy can be accurately described as the kinetic energy of particles in a system. Notably, thermal energy is a key component of a system's internal energy but is distinct from potential energy, which is another component of internal energy. Temperature measurement, on the other hand, quantifies the concentration of this kinetic energy within the system, providing a direct proportional relationship between temperature and thermal energy at the molecular level.

Answer:

Diffusion occurs in solid and liquid through the constant and random motion of the smaller particles called molecules of either solid, liquid or gaseous in permeable medium as witnessed in the experiment.

Explanation:

The kinectic molecular theory of matter states that the smaller particles of matters called molecules are in constant, but random motion and the degree of movement of the molecules depends on the state or phase such matter exist, which is a derivative of the total kinetic energy possessed by the molecules. This average kinetic energy of the molecules as iodine for example is proportional to the temperature of the matter.

Diffusion should be remembered as the movement of molecules of matters from a highly concentrated region otherwise called hypertonic region to a less concentrated region called hypotonic region through a permeable medium until there is an equilibrium in the system. Since diffusion is expected to involve the movement of molecules, and any matter that can exhibit diffusion is said to have moving molecules, therefore, the kinetic molecular theory of matter is proven to be accurate with the observed movement of iodine molecules in the test tube. This shows that even the molecules of solid matters are in constant random motion, this is made more convincing when these molecules migrate without the addition of external energy source like heat, which then help to understand that the natural iodine molecules are in constant random motion, as they are changed to gaseous state without passing through liquid state, a phenomenon called sublimation.

Answer:

The correctly matched pair is :

[tex]NH_{3}[/tex] is Polar

Explanation:

Polarity is decided by net dipole moment . If a molecule has 0 dipole moment then it is non-polar .

If a molecule has some value of dipole moment then it is polar.Unit of dipole moment is Debye(D)

[tex]{dipole moment = charge \times distance}[/tex]

In chemical value of dipole is based on two factors :

1. There should be heteroatomic bond in a given compound..e.g H-Cl , C-N

(not C-C, N-N)

2. The molecule should be unsymmetrical in shape.

note : even if all bonds are heteroatomic but shape is symmetrical , then also dipole moment can be zero

CORRECT MATCHES

[tex]H_{2}O[/tex] : Polar

It has net dipole moment of 1.85 D because its shape is bent (unsymmetrical) and all bonds are heteroatomic.

[tex]CH_{4}[/tex] :Non-Polar

All bonds are heteroatomic(C-H) but shape is symmetrical(tetrahedral), so net dipole is zero

[tex]CO_{2}[/tex] : Non -Polar

All bonds are heteroatomic(C=O) but shape is symmetrical(linear), so net dipole is zero

NH3 is correctly identified as polar due to its trigonal pyramidal shape causing an unequal electron distribution. In contrast, H2O is polar (not non-polar), CH4 is non-polar (not polar), and CO2 is non-polar (not polar), illustrating the importance of geometric arrangement in determining molecular polarity.

The question involves understanding molecular polarity, a fundamental concept in chemistry. The correct pairing from the options provided is NH3: polar. Let's delve into the rationale behind this answer and correct the misconceptions concerning the other molecules listed.

To summarize, molecular polarity is determined not only by the presence of polar bonds but also by the molecule's geometry. In this context, NH3 is the correct answer since it is polar due to its geometry leading to an unequal distribution of electron density.

Answer:

Mass = 112.54 g

Explanation:

Given data:

Mass of copper = 18 g

How much copper(II) nitrate formed = ?

Solution:

Cu + 2AgNO₃  →  Cu(NO₃)₂ + 2Ag

Number of moles of copper:

Number of moles = mass/ molar mass

Number of moles = 18 g/ 29 g/mol

Number of moles = 0.6 mol

Now we will compare the moles of Cu with Cu(NO₃)₂ .

             Cu        :        Cu(NO₃)₂

              1           :             1

           0.6          :           0.6

Mass of Cu(NO₃)₂ :

Mass = number of moles × molar mass

Mass = 0.6 mol × 187.56 g/mol

Mass = 112.54 g

Answer:

1.024 x 10⁻²²g

Explanation:

Data Given:

mass of copper = 63.5 g

no. of atoms of copper = 6.02 x10²³ atoms

mass of of an average copper = ?

Solution:

As 6.02 x10²³ atoms have 63.5 g of mass then what will be the mass of atom.

Apply unity formula

                     63.5 g of copper ≅ 6.02 x10²³ atoms of copper

                     mass of copper atom ≅ 1 atom of copper

Do cross multiplication

                     mass of copper atom = 1 atom x 63.5 g / 6.02 x10²³ atoms

                     mass of copper atom = 1.024 x 10⁻²² g

mass of an average copper atom = 1.024 x 10⁻²² g

Answer:

Niels Bohr

Explanation:

It's been long thought that the atomic model resembles a planet model, that is, it was thought that the nucleus containing neutrons and protons is the central part of the atom and there were electrons in several shells orbiting the nucleus.

This is called a planet model, since it follows the pattern seen in our galaxy: the Sun corresponds to a nucleus and the planets orbiting it are like electrons.

This model was proposed by Niels Bohr in 1915 and is called the Bohr Model. In the end, it was proved that the model wasn't really accurate, since electrons didn't have fixed orbitals but rather probabilities to be found in those orbitals, as well as the fact that electrons were exhibiting the properties of waves.

Answer: 3.295moles

Explanation:Please see attachment for explanation

Answer:

B

Explanation:

I took the test

-Leyla-

wishing you success

Nuclear fission

Hope I helped :)

The model illustrates the nuclear process of fission, where a larger nucleus splits into two or more smaller nuclei along with the release of energy.

Nuclear fission is the process illustrated, where a neutron causes a fissile atom like U-235 to split into smaller nuclei, releasing energy and more neutrons. During fission, the nucleus undergoes division, resulting in the production of additional particles and the liberation of energy.

The nuclear process illustrated by the model is nuclear fission. In nuclear fission, a neutron collides with a fissile atom like U-235, creating a heavier unstable isotope, in this case, U-236. This unstable nucleus then undergoes fission, splitting into smaller nuclei and releasing additional neutrons along with a significant amount of energy.

The liquid drop model proposed by Niels Bohr and John Wheeler explains this by comparing the nucleus to a droplet of water. When an external neutron impacts the uranium nucleus, it causes the nucleus to deform and eventually split, similar to a vibrating water droplet eventually breaking apart. The process can be tracked using nuclear symbols, and understanding it is crucial for applications like nuclear reactors where controlled fission is used for electricity generation.

Moreover, the models constructed to describe the nucleus should accurately reflect known nuclear properties and predict new properties that experiments might reveal. These predictions help in understanding nuclear processes such as fission in greater detail.

Answer:

the wrong option is  The charges on the polar bonds are

arranged so that they are balanced.​

Explanation:

if an electron is more electro negative it has more tendency to pull the valence electron towards itself.

electronegativity is the measure of the tendency of an atom to attract bonding pair of electron towards itself.

electro negativity increases along the group and decreases down the group.

nitrogen is more electronegative than hydrogen so it will tend to attract the bonding pair of electron towards itself.

therefore electrons are not evenly shared between the atoms

Answer:

Electrons are evenly shared among the

atoms.

Explanation:

all the others are obviously wrong

Answer:

It corresponds to Charles' Law

Explanation:

Charles's Law corresponds to one of the gas laws, where temperature and volume are related, to constant pressure. That is, according to said equation, the volume of a gas varies directly with the temperature, under conditions of constant pressure.

1. Meteorologist predict the weather by using tools. They use these tools to measure atmospheric conditions that occurred in the past and present, and they apply this information to create educated guesses about the future weather. The best we can do is observe past and present atmospheric patterns and data, and apply this information to what we think will happen in the future. Meteorologists use the scientific method on a daily – and even hourly – basis!

2. They use thermometers, barometers, sling psychrometers and rain gauges. They also use anemometers, hygrometers, weather maps, weather balloons and weather satellites.

Final answer:

Meteorologists make weather predictions by using weather stations and radar to gather data and analyze patterns in the atmosphere.

Explanation:

Meteorologists make weather predictions by using various tools to gather data and analyze patterns in the atmosphere.

Two types of weather tools commonly used by meteorologists are:

Weather stations: These are equipped with instruments such as barometers to measure air pressure, thermometers to measure temperature, and anemometers to measure wind speed and direction.

Radar: Weather radar uses radio waves to detect precipitation and track its movement. This information is crucial for predicting the path and intensity of storms.

By collecting data from these tools and analyzing it, meteorologists can make accurate weather predictions.

Answer:

Supersaturated

Explanation:

Let's define the types of solutions in the context of this problem firstly:

We need to use a solubility curve for salts given below. Notice that the intersection in the y-axis at [tex]40^oC[/tex] is at about 14 g. This means a saturated solution would be obtained if 14 g of [tex]KClO_3[/tex] were dissolved in 100 g of water at this temperature. Anything above it would yield a supersaturated solution, below – an unsaturated solution.

Hence, we have a supersaturated solution.

Answer:

The elements with the largest atomic radii are located towards the left and bottom of the periodic table (i.e. at the bottom of Group 1). Thus, in theory, the largest atom should be Francium.

it is Francium

Explanation:

Final answer:

To find the number of carbon atoms in the empirical formula for C10H22O2, divide each element's subscript by the greatest common divisor, which is 2. The resulting empirical formula is C5H11O, which means there are 5 carbon atoms.

Explanation:

To determine how many carbon atoms are there in the empirical formula corresponding to C10H22O2, you first need to find the simplest whole-number ratio of carbon (C) to hydrogen (H) to oxygen (O) atoms. The molecular formula C10H22O2 shows that the compound has 10 C atoms, 22 H atoms, and 2 O atoms. However, this is not the simplest whole-number ratio. We can divide each of the subscripts by the greatest common divisor, which in this case is 2, to find the empirical formula. So the empirical formula is C5H11O, meaning that the smallest ratio of elements in the compound is 5 carbon atoms to 11 hydrogen atoms to 1 oxygen atom.

Final answer:

The empirical formula for the compound C10H22O2 is achieved by simplifying to the simplest whole-number ratio, resulting in the formula C5H11O, which indicates there are 5 carbon atoms in the empirical formula.

Explanation:

To find out how many carbon atoms there are in the empirical formula for the compound with the molecular formula C10H22O2, we need to simplify the formula by dividing by the greatest common divisor of the subscripts of each element. The goal is to achieve the simplest whole-number ratio of the atoms in the compound.

The numbers of atoms of each element in the molecular formula are in the ratio 10:22:2 for carbon, hydrogen, and oxygen respectively. By simplifying, we find that this ratio can be divided by 2, which gives us 5:11:1. Therefore, the smallest whole-number ratio, which provides us with the empirical formula, is C5H11O. Hence, there are 5 carbon atoms in the empirical formula.

Answer:

A: 2.525 x 10⁻⁴ mol

B: 2.583 x 10⁻⁴ mol

Explanation:

Part A:

Data Given:

Convert Temperature to Kelvin

T = °C + 273

T = 21.3 + 273 = 294.3 K

Convert mL to liter

1000 mL = 1 L

5.1 ml = 5.1/1000 = 0.0051 L

Solution

no. of moles can be calculated by using ideal gas formula

                         PV = nRT

Rearrange the equation for no. of moles

                          n= PV / RT . . . . . . . . . (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm / mol. K

Now put the value in formula (1) to calculate no. of moles of

              n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K

              n = 0.0061 atm.L / 24.162 L.atm.mol⁻¹

              n = 2.525 x 10⁻⁴ mol

no. of moles of gas (H₂O) = 2.525 x 10⁻⁴ mol

_______________

Part B:

Data Given:

Convert Temperature to Kelvin

T = °C + 273

T = 21.3 + 273 = 294.3 K

Convert mL to liter

1000 mL = 1 L

5.2 ml = 5.2/1000 = 0.0052 L

Solution

no. of moles can be calculated by using ideal gas formula

                         PV = nRT

Rearrange the equation for no. of moles

                         n= PV / RT . . . . . . . . . (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm / mol. K

Now put the value in formula (1) to calculate no. of moles of

              n = 1.2 atm x 0.0052 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K

              n = 0.0062 atm.L / 24.162 L.atm.mol⁻¹

              n = 2.583 x 10⁻⁴ mol

no. of moles of gas (H₂) = 2.583 x 10⁻⁴ mol

Answer:

Explanation:

Molar mass:

Molar mass of substance is sum of atomic weight of all the atoms of elements present in it.

HCl

Atomic weight of hydrogen = 1.00 amu

Atomic weight of chlorine = 35.45 amu

Atomic weight of HCl =  1.00+35.45 = 36.45 g/mol

K₂SO4:

Atomic weight of potassium = 39.09× 2 = 78.18 amu

Atomic weight of sulfur = 32.07 amu

Atomic weight of oxygen = 15.99×4 = 63.96 amu

Atomic weight of K₂SO4 =  63.96+32.07+ 78.18 = 174.21 g/mol

Ca(OH)₂:

Atomic weight of calcium = 40.08 amu

Atomic weight of oxygen = 15.99 × 2 amu = 31.98 amu

Atomic weight of hydrogen = 1.00 × 2 = 2.00 amu

Atomic weight of Ca(OH)₂ = 74.06 g/mol

NaOH:

Atomic weight of sodium = 22.99 amu

Atomic weight of oxygen = 15.99 amu

Atomic weight of hydrogen = 1.00 amu

Atomic weight of NaOH = 39.98 g/mol

NO₃:

Atomic weight of nitrogen = 14.01 amu

Atomic weight of oxygen = 15.99×3 = 47.97 amu

Atomic weight of NO₃ = 61.98 g/mol

Second row of periodic table can have maximum of eight electrons which are occupied within s and p block section by occupying 2 and 6 electrons respectively and thus becoming stable thus it doesn't have d block section.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

104.352°C

Explanation:

Data Given:

Boiling point of water = 100.0°C

Kb (boiling point constant = 0.512°C/m

Concentration of the Mg₃(PO₄)₂ = 8.5 m

Solution:

Formula Used to find out boiling point

               ΔTb = m.Kb . . . . . . (1)

where

               ΔTb = boiling point of solution - boiling point of water

So,

we can write equation 1 as under

               ΔTb = Tb (Solution) -Tb (water)

As we have to find out boiling point so rearrange the above equation

              Tb (Solution)  = m.Kb + Tb (water) . . . . . . . (2)

Put values in Equation 2

            Tb (Solution)  = (8.5 m x 0.512°C/m ) + 100.0°C

            Tb (Solution)  = 4.352 + 100.0°C

            Tb (Solution)  = 104.352°C

so the boiling point of Mg₃(PO₄)₂  8.5 m solution =  104.352°C

Answer:

The correct functions of the cell membrane are:

Explanation:

The cell membrane is known to be the gatekeeper of a cell. This is because it selectively regulates which materials to let enter into a cell and which materials need to be exited from the cell. Gases like oxygen and carbon dioxide can easily pass through the cell membrane by diffusion. The cell membrane stops the entry of any kind of harmful component into the cell hence, protecting the cell.

The cell membrane is a vital component for the cell's survival. It lets in oxygen and carbon dioxide, stops harmful substances from coming in, and acts as a barrier or gatekeeper; however, it doesn't prevent harmful substances from exiting the cell.

The cell membrane, also known as the plasma membrane, has several vital functions in maintaining the life and health of a cell. This includes allowing useful substances like oxygen and carbon dioxide to enter and exit, acting as a protective barrier to prevent harmful chemicals from entering the cell and allowing certain substances to exit, hence acting like a 'gatekeeper'. Therefore, the correct answers are 'allows oxygen to enter', 'allows carbon dioxide to enter', 'stops harmful chemicals from entering' and 'acts like a gatekeeper'. It does not, however, 'stop harmful chemicals from exiting', as the membrane cannot differentiate between harmful or beneficial when it comes to exiting.

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